:root{--bg:#f4f6f8;--panel:#fff;--text:#17202a;--muted:#667085;--border:#d9dee7;--brand:#0066cc;--ok:#027a48;--danger:#b42318;--shadow:0 10px 30px rgba(16,24,40,.08);--radius:18px}*{box-sizing:border-box}body{margin:0;font-family:Arial,Helvetica,sans-serif;background:var(--bg);color:var(--text)}header{max-width:1280px;margin:0 auto;padding:28px 24px 10px}h1{margin:0 0 8px;font-size:30px;letter-spacing:-.03em}header p{margin:0;color:var(--muted);line-height:1.5}main{max-width:1280px;margin:0 auto;padding:24px;display:grid;grid-template-columns:minmax(340px,500px) 1fr;gap:24px;align-items:start}.panel{background:var(--panel);border:1px solid var(--border);border-radius:var(--radius);box-shadow:var(--shadow)}.form-panel,.preview-panel{padding:20px}.preview-panel{position:sticky;top:18px}fieldset{border:0;padding:0;margin:0 0 22px}legend{font-weight:800;font-size:15px;margin-bottom:12px}.grid-2{display:grid;grid-template-columns:1fr 1fr;gap:12px}label{display:block;font-size:13px;color:#344054;margin-bottom:6px;font-weight:700}input,select,textarea{width:100%;border:1px solid var(--border);border-radius:12px;padding:11px 12px;font:inherit;background:#fff;color:var(--text);outline:none}textarea{min-height:80px;resize:vertical}input:focus,select:focus,textarea:focus{border-color:var(--brand);box-shadow:0 0 0 4px rgba(0,102,204,.12)}input[type=color]{height:44px;padding:5px}.hint{font-size:12px;color:var(--muted);line-height:1.4;margin:6px 0 0}.actions{display:flex;flex-wrap:wrap;gap:10px;margin-top:18px}.top-actions{margin-top:0}button{border:0;border-radius:999px;padding:11px 16px;font:inherit;font-weight:800;cursor:pointer;background:var(--brand);color:#fff}button.secondary{background:#eef2f6;color:#1d2939}button.ghost{background:#fff;color:var(--brand);border:1px solid var(--border)}.preview-toolbar{display:flex;justify-content:space-between;gap:12px;align-items:center;margin-bottom:14px}.preview-toolbar h2{margin:0;font-size:18px}.preview-box{border:1px dashed #b7c2d0;border-radius:16px;padding:22px;background:#fff;overflow:auto}.preview-box.mobile{max-width:420px;margin-inline:auto}.status{margin-top:12px;font-size:13px;color:var(--muted);min-height:18px}.status.ok{color:var(--ok)}.status.error{color:var(--danger)}.score{margin-top:16px;padding:14px;background:#f9fafb;border:1px solid var(--border);border-radius:14px;font-size:13px;line-height:1.45;color:#344054}.score strong{display:block;margin-bottom:6px;color:var(--text)}.score ul{margin:8px 0 0 18px;padding:0}.score li{margin:4px 0}code{display:block;white-space:pre-wrap;word-break:break-word;background:#101828;color:#f2f4f7;padding:14px;border-radius:14px;margin-top:14px;max-height:280px;overflow:auto;font-size:12px}.hidden{display:none}@media(max-width:920px){main{grid-template-columns:1fr}.preview-panel{position:static}}@media(max-width:560px){main,header{padding-left:14px;padding-right:14px}.grid-2{grid-template-columns:1fr}.preview-toolbar{align-items:flex-start;flex-direction:column}}

.toggle-grid{display:grid;grid-template-columns:1fr 1fr;gap:8px 12px}.check{display:flex;align-items:center;gap:8px;margin:0;font-size:13px;color:#344054;font-weight:700}.check input{width:auto;margin:0}.image-controls{margin-top:12px}input[type=range]{padding:0;height:38px}
@media(max-width:560px){.toggle-grid{grid-template-columns:1fr}}